I was on a ketogenic diet and then ate a reeses peanut butter cup and before I knew it couldn’t lift my limbs without extreme effort. I had d lactate acidosis. Fast forward and antibiotics got rid of it along with non d lactate producing probiotics. The mid level fatigue still remains outside of eating hours. Could it be that the body was conditioned to use the lactate pathway and is blocking pyruvate from entering the Krebs cycle?